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(until 1921, San-Beise; until 1941, Baian-Tumen), a city in the eastern Mongolian People’s Republic, near the Chinese border, on the Kerulen River. Administrative center of Eastern Aimak. Population, 22,500 (1975). Choibalsan is connected by railroad with the Solov’evsk station of the Trans-Siberian Railroad in the USSR. It is a highway junction and is connected by air with Ulan Bator. Building materials are manufactured in Choibalsan, and the city has automotive-repair facilities. A milling combine, a meat-packing plant, and a wool-scouring plant are located there. Brown coal and fluorite (in Berkh) are mined in the area.